org.apache.commons.collections4.functors
Class UniquePredicate<T>

java.lang.Object
  extended by org.apache.commons.collections4.functors.UniquePredicate<T>
All Implemented Interfaces:
Serializable, Predicate<T>

public final class UniquePredicate<T>
extends Object
implements Predicate<T>, Serializable

Predicate implementation that returns true the first time an object is passed into the predicate.

Since:
3.0
Version:
$Id: UniquePredicate.java 1476582 2013-04-27 14:13:54Z tn $
See Also:
Serialized Form

Constructor Summary
UniquePredicate()
          Constructor that performs no validation.
 
Method Summary
 boolean evaluate(T object)
          Evaluates the predicate returning true if the input object hasn't been received yet.
static
<T> Predicate<T>
uniquePredicate()
          Factory to create the predicate.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

UniquePredicate

public UniquePredicate()
Constructor that performs no validation. Use uniquePredicate if you want that.

Method Detail

uniquePredicate

public static <T> Predicate<T> uniquePredicate()
Factory to create the predicate.

Type Parameters:
T - the type that the predicate queries
Returns:
the predicate
Throws:
IllegalArgumentException - if the predicate is null

evaluate

public boolean evaluate(T object)
Evaluates the predicate returning true if the input object hasn't been received yet.

Specified by:
evaluate in interface Predicate<T>
Parameters:
object - the input object
Returns:
true if this is the first time the object is seen


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